Lennox 11U64 Pressure Switch
The Lennox 11U64 Pressure Switch (Cat # 11U64, Part # 104371-01) is a precision-calibrated OEM furnace replacement part engineered for high-performance draft verification. This 0.65" WC SPST pressure switch is the direct substitute for the legacy 93W86 model, designed to monitor inducer motor performance and confirm proper airflow before the ignition sequence initiates. Built with brass terminals, fine silver contacts, and a stainless steel calibration spring, this switch ensures mechanical reliability in demanding thermal environments. It features a single-pole single-throw (SPST) normally open configuration and is rated for 5A resistive at 24 VAC. Suitable for residential gas furnaces operating between 0 and 4,500 feet, this component prevents system lockouts by detecting restricted venting or inducer failure. When troubleshooting Lennox furnace ignition failure, verify the .65" wc set point with a manometer to ensure the UniControl NS2-1399-01 diaphragm is engaging within factory tolerances.
Key Benefits for Technicians:- Direct OEM Replacement: replaces superseded part number 93W86, ensuring exact fit and manifold alignment.
- Enhanced Durability: utilize fine silver contacts and brass terminals to prevent carbon tracking and electrical pitting.
- High-Altitude Ready: factory calibrated for reliable performance in standard and mid-altitude installations (up to 4,500 ft).
- Safe Combustion: provides critical negative pressure monitoring to ensure combustion move safely through the flue.
Is the 11U64 compatible with the older 93W86 pressure switch?
Yes, the 11U64 is the official Lennox service replacement for the 93W86. While the physical housing may differ slightly, the 0.65" WC trip point and electrical specifications are identical for system compatibility.
Why is my furnace inducer running but not igniting?
This often indicates the pressure switch is stuck open. Check for water in the pressure switch hose, a clogged collection box port, or a restricted chimney flue that prevents the vacuum from reaching the 0.65" WC threshold.
How do I test the continuity of this switch?
With the furnace powered off and the inducer stationary, the SPST normally open switch should show infinite resistance. Once the inducer creates a vacuum exceeding 0.65" WC, the circuit should close, showing near-zero ohms.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $28.90
-65%$28.90
$10.11Lennox 11U64 Pressure Switch
The Lennox 11U64 Pressure Switch (Cat # 11U64, Part # 104371-01) is a precision-calibrated OEM furnace replacement part engineered for high-performance draft verification. This 0.65" WC SPST pressure switch is the direct substitute for the legacy 93W86 model, designed to monitor inducer motor performance and confirm proper airflow before the ignition sequence initiates. Built with brass terminals, fine silver contacts, and a stainless steel calibration spring, this switch ensures mechanical reliability in demanding thermal environments. It features a single-pole single-throw (SPST) normally open configuration and is rated for 5A resistive at 24 VAC. Suitable for residential gas furnaces operating between 0 and 4,500 feet, this component prevents system lockouts by detecting restricted venting or inducer failure. When troubleshooting Lennox furnace ignition failure, verify the .65" wc set point with a manometer to ensure the UniControl NS2-1399-01 diaphragm is engaging within factory tolerances.
Key Benefits for Technicians:- Direct OEM Replacement: replaces superseded part number 93W86, ensuring exact fit and manifold alignment.
- Enhanced Durability: utilize fine silver contacts and brass terminals to prevent carbon tracking and electrical pitting.
- High-Altitude Ready: factory calibrated for reliable performance in standard and mid-altitude installations (up to 4,500 ft).
- Safe Combustion: provides critical negative pressure monitoring to ensure combustion move safely through the flue.
Is the 11U64 compatible with the older 93W86 pressure switch?
Yes, the 11U64 is the official Lennox service replacement for the 93W86. While the physical housing may differ slightly, the 0.65" WC trip point and electrical specifications are identical for system compatibility.
Why is my furnace inducer running but not igniting?
This often indicates the pressure switch is stuck open. Check for water in the pressure switch hose, a clogged collection box port, or a restricted chimney flue that prevents the vacuum from reaching the 0.65" WC threshold.
How do I test the continuity of this switch?
With the furnace powered off and the inducer stationary, the SPST normally open switch should show infinite resistance. Once the inducer creates a vacuum exceeding 0.65" WC, the circuit should close, showing near-zero ohms.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
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Description
The Lennox 11U64 Pressure Switch (Cat # 11U64, Part # 104371-01) is a precision-calibrated OEM furnace replacement part engineered for high-performance draft verification. This 0.65" WC SPST pressure switch is the direct substitute for the legacy 93W86 model, designed to monitor inducer motor performance and confirm proper airflow before the ignition sequence initiates. Built with brass terminals, fine silver contacts, and a stainless steel calibration spring, this switch ensures mechanical reliability in demanding thermal environments. It features a single-pole single-throw (SPST) normally open configuration and is rated for 5A resistive at 24 VAC. Suitable for residential gas furnaces operating between 0 and 4,500 feet, this component prevents system lockouts by detecting restricted venting or inducer failure. When troubleshooting Lennox furnace ignition failure, verify the .65" wc set point with a manometer to ensure the UniControl NS2-1399-01 diaphragm is engaging within factory tolerances.
Key Benefits for Technicians:- Direct OEM Replacement: replaces superseded part number 93W86, ensuring exact fit and manifold alignment.
- Enhanced Durability: utilize fine silver contacts and brass terminals to prevent carbon tracking and electrical pitting.
- High-Altitude Ready: factory calibrated for reliable performance in standard and mid-altitude installations (up to 4,500 ft).
- Safe Combustion: provides critical negative pressure monitoring to ensure combustion move safely through the flue.
Is the 11U64 compatible with the older 93W86 pressure switch?
Yes, the 11U64 is the official Lennox service replacement for the 93W86. While the physical housing may differ slightly, the 0.65" WC trip point and electrical specifications are identical for system compatibility.
Why is my furnace inducer running but not igniting?
This often indicates the pressure switch is stuck open. Check for water in the pressure switch hose, a clogged collection box port, or a restricted chimney flue that prevents the vacuum from reaching the 0.65" WC threshold.
How do I test the continuity of this switch?
With the furnace powered off and the inducer stationary, the SPST normally open switch should show infinite resistance. Once the inducer creates a vacuum exceeding 0.65" WC, the circuit should close, showing near-zero ohms.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
